Anytime.
This question is impossible to answer since we have no idea of location where these calves are born, location as in country or state/province.
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A cow can deliver one calf at a time.
Moose typically give birth to one calf at a time, though twins can occasionally occur. The calves are usually born in the spring, and they are able to walk and swim shortly after birth.
If it is a group of calves born from different mothers than you call them a herd of calves or a group of calves. If it is two calves born at the same time from the same mother than they are twins, just the same as human offspring would be called.
Only once a year.
Manatees are at least a year old when they have calves.
two calves were born yesterday.
No. Blue eyes in calves is a very rare genetic occurrence. Almost all calves born into this world are born with brown eyes, not blue.
Always one. I've never heard of two calves being born at the same time; if there were twins, it's always one after the other, as the cow's pelvis is only wide enough to allow one calf through at a time.
Depends on the breed. Most calves can gain between 600 and 800 lbs in their first year.